A fence valve to catch material introduced into a pipe includes a housing defining a chamber and a catch plate disposed within the chamber that is movable with respect to the housing. The catch plate includes at least one magnetic region. The valve further includes a magnetic body in communication with at least a portion of the chamber, an indicator in communication with the catch plate, and a cable having a first end secured to the catch plate and a second end secured to a hook. The catch plate is transitionable from a first position in which the catch plate is disposed at a first location within the chamber, to a second position in which the catch plate is displaced from the first location. The catch plate is detachably held in the first position by interaction between the at least one magnetic region and the magnetic body.